I am a newbie to modding in general but this should be true.

Primarily Environmental Air Density wasn't mentioned as a contributing factor to ping

Altitude, Temperature, and Humidity are all contributing factors to the air density; Generally speaking the lower the better for those 3, cold air at low altitude with low humidity are the best conditions you can hope for.

Ive also read that aluminum heads can lower pinging since they absorb more heat from the combustion - Generally speaking aluminum heads are more sensitive to heat and are prone to cracking. But i am still looking into the possibility of these for a daily driver (although expensive)

-GeeBee